editing noah classified scripts

Hyperspace2

Hello people, i want to edit noah classified script for my own purpose. So I am asking a straight question , I want to change submit ad--->submit gossip

and
Advertisement in this category---->gossip in this category

Notify me when new ads are submitted in this category---->notify me when new gossips are submitted in this category.

I was able to change title of webpage, so i think if people here tell me where to go , i think i will be able to change it. Please help. Thanks in advance

link of demo is here http://www.softaculous.com/demos/Noahs_Classifieds